const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
//导入express-session中间件
const expressSession = require('express-session')
//导入connect-mongo包
const connectMongo = require('connect-mongo')
//导入配置文件
const { DBHOST, DBPORT, DBNAME } = require('./config/config')


//创建服务端对象
const app = express();


//设置中间件(配置session信息)
app.use(expressSession({
  name: 'sid', //设置session ID的键名
  secret: 'bilibili', //提高代码的安全等级
  saveUninitialized: false, //是否为每次请求都设置一个cookie来储存sid
  resave: true, //是否在每次请求时都重新保存session
  store: connectMongo.create({
    mongoUrl: `mongodb://${DBHOST}:${DBPORT}/${DBNAME}` //数据库的连接配置
  }),
  cookie: {
    httpOnly: true, //开启后前端无法通过JS操作
    maxAge: 1000 * 60 * 60//设置sid过期的时间，单位是毫秒
  }
}))


//导入路由规则
const indexRouter = require('./routes/web/index')
const authRouter = require('./routes/web/auth')
const indexApiRouter = require('./routes/api/index')
const authApiRouter = require('./routes/api/auth')


// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));


//使用路由规则
app.use(indexRouter)
app.use(authRouter)
app.use('/api', indexApiRouter)
app.use('/api', authApiRouter)

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
